Early career 2019 During the 2019 season, Fellon participated in the
2019 Red Bull MotoGP Rookies Cup. He finished all twelve races of the championship in the points, with a fourth place finish in the last race of the season at Aragón. He finished the season fifth in the standings collecting 116 points, and was one of only two riders to not retire from any round.
2020 Fellon made his debut in the
2020 FIM CEV Moto3 Junior World Championship with Junior team 0,0 Estrella Galicia. He started the season without scoring points on the first two races, retiring in a crash in first race in Jerez. From the following race onwards until the second race in Valencia, he scored points in all races, obtaining his best result of 4th in the first race at Aragón.
Moto3 World Championship Sic58 Squadra Corse (2021–2022) In 2021, Fellon debuted in the Moto3 World Championship with SIC58 Squadra Corse. He was the only full-time rider to not score a point in the
2021 season.
CIP Green Power (from 2023) From 2023 season, Fellon competed for the CIP Green Power racing team. ==Career statistics==